Multiple tapping device and similar tool.



F. A. ERRINGTON.

MULTIPLE TAPPING DEVICE AND SIMILAR TOOL.

APPLICATION FILED SEPT. 23. I914.

1,2 6,%@ Patented May 15, 1917.

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FRANKLIN A. ERRINGTON, OF STAPLETON, NEW YORK.

MULTIPLE TAPPING DEVICE AND SIMILAR TOOL.

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To all whom it may concern:

Be it known that I, FRANKLIN ALFRED ERRINGTON, a citizen of the UnitedStates, residing at Stapleton, in the county of Richmond and State ofNew York, have lIWBIltBd certain new and useful Improvements in MultipleTapping Devices and Similar Tools, of which the following is aspecification. 7

My invention relates broadly to multiple tapping devices for attachmentto a one spindle drill press orsimilar machine thereby actuating adouble-depth main driving gear suitably journaled in the non-rotary caseof my device; this double-depth main driving gear drives a plurality ofsupplementary tapping units journaled in said case at suitable distancesapart, each tapping unit consisting of a supplementary driving gear anda supplementary reversing gear, each having a suitable clutch to engagea clutch carried by a tapping spindle journaled in said gears andmovable longitudinally thereof, to drive a tap carried by said spindlealternately in opposite directions; and more particularly to means fordriving said plurality of tapping spindles at a comparatively slow speedwhile the tap is cutting the threads in the work, means to stop said tapautomatically when the work is completed and means to reverse thedirection of rotation of said tap and to withdraw it from the work at amuch higher speed; and my invention further consists in the noveldetails of improvement and combination of parts that will be more fullyhereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompany ing drawings, forming aparthereof, wherein :Figure 1 represents a vertical cross-section of adevice embodyingmyinvention, the parts being shown in thedrivingposition; Fig. 2 is a top plan view of the device, the case beingshown in section on the line 22 of Fig. 1 and the internal mechanism infull lines, except where partly sectioned to illustrate more clearly thevarious connections between the several parts; and attention is calledto the fact that all the tapping spindles will be simultaneously in thesame relative position during the same periods of the operations,although I have shown in Fig. 2 one tapping unit with its clutch-bar inthe driving position in unit A, whereas in unit Specification of LettersPatent.

Patented May 15, rare.

13 the clutch-bar is illustrated in its reversing position.

Similar numerals and letters of reference indicate corresponding partsin the several views.

A non-rotative case is shown in two sections 1, 1, held together bysuitable screws, as indicated at 1 said case being held from rotation bya rod 1. A main double-depth driving gear is preferably made up of twoseparate gears 2, 2 keyed to a main driving spindle 3 by keys 3, in sucha manner that the upper and lower sections 2, 2" rotate in unison witheach other and with spindle 3, the latter being adapted at its outer endfor connection with the spindle of a drill press 01' similar machine,the device being adapted for use in either a vertical or horizontalposition. The upper portion 2, of the doubledepth main driving gear 2, 2is preferably of less diameter than the lower portion 2 whicharrangement is designed to provide a quick-return movement to thetapping units hereinafter described. A plurality of pinions 4: arejournaled on axles t carried by case 1, said pinions meshing with theupper portion 2 of the main driving gear, and also with thesupplementary driving gears 5, of a plurality of tapping units A, B, G,D, E, F, said tapping units having each a reversing gear 6, meshingdirectly with the lower section 2 of the main driving gear; whereby saidsupplementary driving and reversing gears are rotated in oppositedirections to each other, the supplementary driving gears being rotatedin the same direction as the main driving gear 2, 2, and the reversinggears being rotated in the opposite direc tion to their respectivedriving gears and at an increased speed (see Fig. 2). A tapping spindle7is provided in each unit, havin a clutch-bar 7*, for engagement withsuitable clutches 5 6 carried by the supplementary driving and reversinggears. The lower or outer ends of the spindles 7 are adapted to grip atap 8, or similar tool.

Each of the tapping units herein shown and described has itssupplementary driv ing-gear of smaller diameter than its associatesupplementary reversing-gear, which is exactly contrary to the usualdesign of individual tapping devices. By this novel design the rigidityof the alinement of the case during the driving operation is greatlyenhanced by the enlarged surface of the lower section of the maindriving-gear, as the thrust of the tools against the work is receivedagainst the lower (or outer) face of this gear.

It will therefore readily be seen that when my device is lowered againstthe work, the tapping spindles 7 will slide up into the driving ortapping position with the clutchbar 7 in mesh with the driving clutches5 of the supplementary driving gears 5, and the taps 8 will be driveninto the Work until the advance of the case 1 is arrested by anysuitable means, whereupon the spiral action of the taps 8 in the workwill pull the clutchbars 7 1 out of mesh with the clutches 5, and thetaps 8 will cease to rotate. The device can then be raised away from thework,

which will bring the clutch bars 7 into mesh 7 with the reversingclutches 6, and the taps 8 will thereby be reversed out of the work witha quick-return.

Having now described my invention what I claim is: I

1. The combination with a non-rotary case having a double-depth maindriving gear suitably journaled therein, a plurality of pinions meshingwith the upper portion of said main driving gear and journaled upon acorresponding plurality of axles carried by said case, of a plurality ofsupplemen' tary tapping units suitably supported by said case to rotatetherein, each of said units having a supplementary driving gear and asupplementary reversing gear, the opposed faces of each of said gearsbeing provided with a clutch adapted to engage an intermediate clutchcarried by a reversible spindle, said spindle being journaled axially ofsaid supplementary gears and movable longitudi nally thereof to engagesaid clutches alternately, the supplementary driving gear of each ofsaid units meshing with the adjacent one of said pinions to turn thesupplementary driving gear in the same direction as the main drivinggear, and the supplementary reversing gear of each of said units meshingdirectly with the lower portion of the main driving gear to turn thesupplementary reversing gears in the direction opposite to that of thedouble-depth main driving gear, substantially as described.

2. The combination with a non-rotary case having a double depth maindriving gear suitably journaled therein, the lower portion of said gearbeing of greater diameter than the upper portion thereof, a plurality ofpinions meshing with the upper portion of said main driving gear andjournaled upon a corresponding plurality of axles carried by said case,of a plurality of supplementary tapping units suitably supported by saidcase, each of said units consisting of a supplementary driving gear anda supplementary reversing gear, the opposed faces of each of said gearsbeing provided with a clutch adapted to engage alternately with anintermediate clutch carried by a reversible spindle, said spindle beingjournaled axially of said supplementary gears and movable longitudinallythereof, the supplementary driving gear of each of said units meshingwith the adjacent one of said pinions to turn the supplementary drivinggear in the same direction as the main driving gear, and thesupplementary reversing gear of each of said units meshing directly withthe enlarged lower portion of said main driving gear to turn thesupplementary reversing gears in a direction opposite to that of themain driving gear and at a greater velocity than their respectivesupplementary driving gears, substantially as described.

3. The combination with a non-rotary case having driving and reversinggears jour naled therein and having their axes in line with each other,the driving-gear being of smaller diameter than the reversing-gear, aspindle journaled in said gears and movable longitudinally thereof, theopposing faces of said gears having clutches to engage an intermediateclutch carried by and adapted to connect said spindle alternately witheither of said gears, and said case being provided with suitablemechanism to rotate said gears in opposite directions and thereversing-gear at a greater velocity than that of the driving-gear,substantially as described. V

Stapleton, Staten Island, N. Y., Sept. 19th, 1914.

FRANKLIN A. ERRINGTON. Witnesses:

F. J. GoonmoK, AUGUST 0. STOCK.

Copies or this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

